This FACT indicates the percentage of males within each Australian state/territory who are obese. Obesity is a medical condition in which excess body fat has accumulated to the extent that it may have an adverse effect on health, leading to reduced life expectancy and/or increased health problems. People are considered as obese, according to the Australian Bureau of Statistics, when their body mass index (BMI – an individual's body mass divided by the square of his height) exceeds 30kg/m2 (BMI of 30.00). Obesity is a real problem in Australia, which is ranked as one of the fattest nations in the developed world. According to Monash University research, the obesity rate has risen over 50 percent in the past 20 years. The state/territory with the highest population of obese males is Tasmania at 35.2 percent. The state/territory with the least obese males is the Australian Capital Territory at 23.2 percent.